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RULE 4 PERFORMANCE STANDARDS <br /> Tri-State Generation and Transmission Assoication, Inc. (Tri-State), owns and operates a 345 kV power <br /> line which is located within the permit boundary and is shown on Map 22. Tri-State is required to <br /> maintain proper phase to ground clearences under all their power lines, and will be conducting ground <br /> disturbances activites within their 150' right-of-way, within the permit boundary, in two approximate <br /> locations as shown on Figure 4.12-3. The final locations to be disturbed will be determined by Tri-State. <br /> These ground disturbing activites are not associated with the Colowyo Mine and will not be required to be <br /> permitted and bonded for in accordance with Rule 3.02.1(2). <br /> In February of 2016, the Colowyo Mine site experienced a very high wind event which snapped a power <br /> pole off at the base and left the power pole dangling from the line. Colowyo constructed an emergency <br /> road into the pole location(0.4 acres of disturbance)to access the location, stabilize the line, and replaced <br /> the broken pole. Topsoil was windrowed with a dozer down gradient of the road footprint to minimimze <br /> surface water flow from the area of disturbance to native areas. Once ground conditions allow access,the <br /> entire road footprint will have the topsoil re-spread on the area, and it will be seeded in accordance with <br /> the approved reclamation seed mixture. Please see Figure 4.12-4 for a location of the emergency road <br /> that was constructed to repair the power pole. <br /> In 2016, the Inactive Mine and Reclamation Program (IMR) began a drilling program to define the burn <br /> limits to abate an underground mine fire at the abandoned underground workings at the Axial Mine. The <br /> Axial Mine workings are shown on Map 22 and are labeled as the Red Wing Mine. The Axial Mine and <br /> Red Wing Mine shared common workings. The drilling project will create ground disturbance within the <br /> permit boundary to support the drilling program. These disturbances may include but are not limited to <br /> temporary roads, drill pads, and mud pits. The final locations to be disturbed will be determined by IMR. <br /> These ground disturbing activities are not associated with the Colowyo's mining activities, and will not <br /> be required to be permitted nor bonded for in accordance with Rule 3.02.1(2). <br /> Rule 4 Performance Standards 4.12-2 Revision Date: 3/31/16 <br /> Revision No.: MR-152 <br />